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-rw-r--r--media/libopus/silk/float/encode_frame_FLP.c372
1 files changed, 372 insertions, 0 deletions
diff --git a/media/libopus/silk/float/encode_frame_FLP.c b/media/libopus/silk/float/encode_frame_FLP.c
new file mode 100644
index 000000000..2092a4d9e
--- /dev/null
+++ b/media/libopus/silk/float/encode_frame_FLP.c
@@ -0,0 +1,372 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */
+static OPUS_INLINE void silk_LBRR_encode_FLP(
+ silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
+ silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
+ const silk_float xfw[], /* I Input signal */
+ opus_int condCoding /* I The type of conditional coding used so far for this frame */
+);
+
+void silk_encode_do_VAD_FLP(
+ silk_encoder_state_FLP *psEnc /* I/O Encoder state FLP */
+)
+{
+ /****************************/
+ /* Voice Activity Detection */
+ /****************************/
+ silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch );
+
+ /**************************************************/
+ /* Convert speech activity into VAD and DTX flags */
+ /**************************************************/
+ if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
+ psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
+ psEnc->sCmn.noSpeechCounter++;
+ if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) {
+ psEnc->sCmn.inDTX = 0;
+ } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
+ psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
+ psEnc->sCmn.inDTX = 0;
+ }
+ psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
+ } else {
+ psEnc->sCmn.noSpeechCounter = 0;
+ psEnc->sCmn.inDTX = 0;
+ psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
+ psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
+ }
+}
+
+/****************/
+/* Encode frame */
+/****************/
+opus_int silk_encode_frame_FLP(
+ silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
+ opus_int32 *pnBytesOut, /* O Number of payload bytes; */
+ ec_enc *psRangeEnc, /* I/O compressor data structure */
+ opus_int condCoding, /* I The type of conditional coding to use */
+ opus_int maxBits, /* I If > 0: maximum number of output bits */
+ opus_int useCBR /* I Flag to force constant-bitrate operation */
+)
+{
+ silk_encoder_control_FLP sEncCtrl;
+ opus_int i, iter, maxIter, found_upper, found_lower, ret = 0;
+ silk_float *x_frame, *res_pitch_frame;
+ silk_float xfw[ MAX_FRAME_LENGTH ];
+ silk_float res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
+ ec_enc sRangeEnc_copy, sRangeEnc_copy2;
+ silk_nsq_state sNSQ_copy, sNSQ_copy2;
+ opus_int32 seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
+ opus_int32 gainsID, gainsID_lower, gainsID_upper;
+ opus_int16 gainMult_Q8;
+ opus_int16 ec_prevLagIndex_copy;
+ opus_int ec_prevSignalType_copy;
+ opus_int8 LastGainIndex_copy2;
+ opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
+ opus_uint8 ec_buf_copy[ 1275 ];
+
+ /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
+ LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;
+
+ psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
+
+ /**************************************************************/
+ /* Set up Input Pointers, and insert frame in input buffer */
+ /**************************************************************/
+ /* pointers aligned with start of frame to encode */
+ x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length; /* start of frame to encode */
+ res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length; /* start of pitch LPC residual frame */
+
+ /***************************************/
+ /* Ensure smooth bandwidth transitions */
+ /***************************************/
+ silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
+
+ /*******************************************/
+ /* Copy new frame to front of input buffer */
+ /*******************************************/
+ silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
+
+ /* Add tiny signal to avoid high CPU load from denormalized floating point numbers */
+ for( i = 0; i < 8; i++ ) {
+ x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f;
+ }
+
+ if( !psEnc->sCmn.prefillFlag ) {
+ /*****************************************/
+ /* Find pitch lags, initial LPC analysis */
+ /*****************************************/
+ silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );
+
+ /************************/
+ /* Noise shape analysis */
+ /************************/
+ silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
+
+ /***************************************************/
+ /* Find linear prediction coefficients (LPC + LTP) */
+ /***************************************************/
+ silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, condCoding );
+
+ /****************************************/
+ /* Process gains */
+ /****************************************/
+ silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding );
+
+ /*****************************************/
+ /* Prefiltering for noise shaper */
+ /*****************************************/
+ silk_prefilter_FLP( psEnc, &sEncCtrl, xfw, x_frame );
+
+ /****************************************/
+ /* Low Bitrate Redundant Encoding */
+ /****************************************/
+ silk_LBRR_encode_FLP( psEnc, &sEncCtrl, xfw, condCoding );
+
+ /* Loop over quantizer and entroy coding to control bitrate */
+ maxIter = 6;
+ gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
+ found_lower = 0;
+ found_upper = 0;
+ gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
+ gainsID_lower = -1;
+ gainsID_upper = -1;
+ /* Copy part of the input state */
+ silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
+ silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+ seed_copy = psEnc->sCmn.indices.Seed;
+ ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
+ ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
+ for( iter = 0; ; iter++ ) {
+ if( gainsID == gainsID_lower ) {
+ nBits = nBits_lower;
+ } else if( gainsID == gainsID_upper ) {
+ nBits = nBits_upper;
+ } else {
+ /* Restore part of the input state */
+ if( iter > 0 ) {
+ silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
+ silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) );
+ psEnc->sCmn.indices.Seed = seed_copy;
+ psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
+ psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
+ }
+
+ /*****************************************/
+ /* Noise shaping quantization */
+ /*****************************************/
+ silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, xfw );
+
+ /****************************************/
+ /* Encode Parameters */
+ /****************************************/
+ silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
+
+ /****************************************/
+ /* Encode Excitation Signal */
+ /****************************************/
+ silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
+ psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
+
+ nBits = ec_tell( psRangeEnc );
+
+ if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
+ break;
+ }
+ }
+
+ if( iter == maxIter ) {
+ if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) {
+ /* Restore output state from earlier iteration that did meet the bitrate budget */
+ silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
+ silk_assert( sRangeEnc_copy2.offs <= 1275 );
+ silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
+ silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) );
+ psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
+ }
+ break;
+ }
+
+ if( nBits > maxBits ) {
+ if( found_lower == 0 && iter >= 2 ) {
+ /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
+ sEncCtrl.Lambda *= 1.5f;
+ found_upper = 0;
+ gainsID_upper = -1;
+ } else {
+ found_upper = 1;
+ nBits_upper = nBits;
+ gainMult_upper = gainMult_Q8;
+ gainsID_upper = gainsID;
+ }
+ } else if( nBits < maxBits - 5 ) {
+ found_lower = 1;
+ nBits_lower = nBits;
+ gainMult_lower = gainMult_Q8;
+ if( gainsID != gainsID_lower ) {
+ gainsID_lower = gainsID;
+ /* Copy part of the output state */
+ silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
+ silk_assert( psRangeEnc->offs <= 1275 );
+ silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
+ silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+ LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
+ }
+ } else {
+ /* Within 5 bits of budget: close enough */
+ break;
+ }
+
+ if( ( found_lower & found_upper ) == 0 ) {
+ /* Adjust gain according to high-rate rate/distortion curve */
+ opus_int32 gain_factor_Q16;
+ gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) );
+ gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) );
+ if( nBits > maxBits ) {
+ gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) );
+ }
+ gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 );
+ } else {
+ /* Adjust gain by interpolating */
+ gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower );
+ /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
+ if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
+ gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
+ } else
+ if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
+ gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
+ }
+ }
+
+ for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+ pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 8 );
+ }
+
+ /* Quantize gains */
+ psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
+ silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
+ &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+ /* Unique identifier of gains vector */
+ gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
+
+ /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
+ for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
+ sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f;
+ }
+ }
+ }
+
+ /* Update input buffer */
+ silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
+ ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) );
+
+ /* Exit without entropy coding */
+ if( psEnc->sCmn.prefillFlag ) {
+ /* No payload */
+ *pnBytesOut = 0;
+ return ret;
+ }
+
+ /* Parameters needed for next frame */
+ psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
+ psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
+
+ /****************************************/
+ /* Finalize payload */
+ /****************************************/
+ psEnc->sCmn.first_frame_after_reset = 0;
+ /* Payload size */
+ *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
+
+ return ret;
+}
+
+/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */
+static OPUS_INLINE void silk_LBRR_encode_FLP(
+ silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
+ silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
+ const silk_float xfw[], /* I Input signal */
+ opus_int condCoding /* I The type of conditional coding used so far for this frame */
+)
+{
+ opus_int k;
+ opus_int32 Gains_Q16[ MAX_NB_SUBFR ];
+ silk_float TempGains[ MAX_NB_SUBFR ];
+ SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
+ silk_nsq_state sNSQ_LBRR;
+
+ /*******************************************/
+ /* Control use of inband LBRR */
+ /*******************************************/
+ if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
+ psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
+
+ /* Copy noise shaping quantizer state and quantization indices from regular encoding */
+ silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
+ silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
+
+ /* Save original gains */
+ silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
+
+ if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
+ /* First frame in packet or previous frame not LBRR coded */
+ psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
+
+ /* Increase Gains to get target LBRR rate */
+ psIndices_LBRR->GainsIndices[ 0 ] += psEnc->sCmn.LBRR_GainIncreases;
+ psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
+ }
+
+ /* Decode to get gains in sync with decoder */
+ silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices,
+ &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+ /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
+ for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+ psEncCtrl->Gains[ k ] = Gains_Q16[ k ] * ( 1.0f / 65536.0f );
+ }
+
+ /*****************************************/
+ /* Noise shaping quantization */
+ /*****************************************/
+ silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR,
+ psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw );
+
+ /* Restore original gains */
+ silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 17:56:02 +0000